Brake mechanism



June 2l 1927- GJ. HAAG BRAKE. MECHANISM Filed oct. 29, 1925 S14/w11 to z Gus rn w/s HAAG L @tto/:Maj ff m7, M641 @mi *WM devices 'arci also; movable' eccentr'cally.; with Patented June 21, 1927'.`V

UNIT-ign As,rii-'rfiszsi` Viii'riiivr OFFICE.

eosravue'iunof. or- New Yom;

lN.. Y., assioma 'ro iN'rEnNATioNA-L Moron ooM- nur; or N Ewyonx; N'.- Y.,'.A 'coni on.arioii or DELAWARE.

Y imm n noiiaivisiir.

more pai'ti'ciilaiily ofthe type-known as.-

brake ineehanisinwherein. the-momentum of the element tobe retarded-'isf'availedfof to*V supplement tlieinit'ial-brake actuating force" in the' application' `o1",-b'ralring' power. The. i'iiesent invention has-'for object'tostill'- fiirtheirsu' plementt'he braking'force resulting from t ie utilizat-i'onof'tlie' momentum Iof the element tobe retarded whereby4 a vrela- 'tiv'ely greaterfbraki'ng effect sattaine'd from a comparatively sri'iall' -initial 'application-of'V power; l'i'i accorda-nce `with the invention mechanical "movements are availed Vot'to increii'se the braking power aii'ordedthrough the instrumentalityof brake" mecha'iiis'iii. vMore particularly actuating devices' -are mov-able concentric witlrrespeotgtothe iX-iiiA about which the-brake shoes movegn the vii'iitia'tioii of the braking' action .and-sind of the braking power iipplied-'to the".b 'riikeH shoes. l'iithe appiicatio'n" off ,--t'he invention to'- the'wheelof' a vehicle; 'tlie-'l'iriilie. driiin carried wit-li tlie-.wli'ee'l 'is rotatable about. the.v

axle housing and. .a -b'rak'e 'spider is -siiiiil'arl'y ro tn table'ftlh'ro ii gli iiiaiiiia'lly operable devices.

Within th'e brake drum are disposed 'brake A:shoes caused' to Contact iv'ith'tlieb'riilc drinn' by iiicai'ii mounted iipon a shaft rotatable' in. the brake s'i'dei towliicli'ithe [brake shoes iiiay be iinciored. Carried-upon-tlierotatf able cam -sliaft is alevr' wh'i'c'h 'is '.i'ilcru'ined upon a cani-shaped lug carriedw'itli the axle housing. 'U vo 'n lthe 'rotation of the spider about the ax e housing' Aby manual actuation' of a brake piilliod .connected thereto, -the cani shaft is caused to-gv rotate diie tothe `arcuate iiioveiiient 'o-its" axis about the'- axis of the axle 'housing throi'igli-the instrumen- .talitv of tli'c'lever 'fiilcriin'iedfeccentiio to the housing. which rotation of '-the" cani shaftVA causes 'the Cain .tovv act'uiite-the brakeslioes... In place .of pivotiiigthe, brakeslioes upon the br'a'lie anchor, a second E cani-sl'iaft may be i: d i'iiiii'eti-i'cal'ly "disposed i'ipoirthe spider with' inspect to th'e' aforesaidcfzijni 's h aft .a iid caused 't'o rotate infn Vsiiiiili'ir.,ii'i'iiiniier by-'iiiiotli'erx cumming 'lug serving iis` a fulcifuni for: a

levercairiedf'with the shaft. H'Iii'tliis in'aiiiier tiro Canis iietiiate'tlie brake slices whereby s'iibetuntiailly oiiedi'alf-tl'ie reaction of one 'brake slice 'is taken-on Vthe last named lug instead-of ii. :brake anchor so that 'approxi-k n'iate1y' fifty per -ceiit more braking power chemical-:equivalents of the oammingIl'ug'and leif. e r v -iulcrumed Athereon Vmay vbe' availed .-o'f' to initiate the application ofthe brake Shoes;

. partly iii lsiectioiiof brake'activating niechai nism accordiiigto the present invention.'

the locatioii'of -a brake drumV and'rbra'kej" 'slices to bezapplied thereto. being'indicted-- of the-"brake mechanism illustrated in' Figure A1; takeniii l'the plane indicated bythe 'and looking inthe" dig,

i'ection' of the ai'frow's. vFigure 3.15; a view similar to. Fi

'sectors are. availed 'of vin the toggle eom iection.A Figure 4 is ii diiigraiiiinatic vi'exvsliowiiig the n iiiiine'r in which the tov le action Vis availed of to initiatetlie app icatio'n of the cams.

Figure 5 is a veiv in section showingthe modified form of the invention. i

'Referring first to the structure'illuiitmted Uiire .lfbiit showing a iiiod'ificatioi'i of'tlie'-b.rii'lre aetuatf ing mechanism' wherein toothed iii Figures 1 and 2 an axle housing a .ivliii'ilif Ais always Arelatively stationary because itis bolted .to the springs ofa'v'ehicle (not shown) is-.slijoivn as :passing through an apeijtu'ie'b in a brake vdrinnA b carried? upon' a wheehnot shown', and therefore rotatable about the relatively' stationaryanle hoiisingi iYi'tliii'rtlie brake driiniband ibearing against" tlie interior surface thereof fare 'illustrated u eely. rotatable about.. the' axle 'lio'ii'siii g a= upon a bearing surface a"V definedA 'Brake shoes c are normally maintained out of vcontact with the brake diiiiii 'by the coil spriiigjsl c. The brake spider is rotatable -about .the aile pair of brakeshoes e, 'a.i"icli ored, ".-asby thei'ivotal; connection 'fl-'toga' brake ilu lli

housing through the instrumentality of a brake pull rod cl2 which may be moved in the direction of the arrow ai manually. Rotatably mounted in the brake spider (Z and diametrically disposed with respect to the pivotal' connection fl is a cam shalt. e

carrying at its end within the brake drinn spiderd is caused lto rotate by relatively vuu .slight force applied to the pull rod d. Rotation of the spider carries the cam shaft c in an arc. Figure 4,- from the position indicated` at to that indicatedl at E2 concentric With the mais o ofthe axle housing a but Aduring such movement the arm e remains fulcruined upon the lug a* eccentric to the axis o. In 'Figure Il the axis of the arm e2 is indicated at E2 und the lug atA4 the radial distance of the cam' shaft e from the axis o being indicated at i. lt will thus be apparent from an inspection of Figure l that due to the angularity ot the radii EL' and 'r that a toggle action obtained which increases the force :nailed ot Vto apply the cam e to the proximate ends of the brake shoes c and at the same time initiates the cumming action.

In lieu of anchoring the brake Aslices to Athe brake spider at cl a.A second cam shaft ma be availed oi' diametrically disposed wit respect to the -tirst 'cam shaft e and similarly provided with -a cam and lever arm fuleruined upon a sector similar -to the lug e but dianietricallydisposed with resiect thereto. Such a structure is shown in Bigures 3 and 5. AIn this constructioi'i upon rotation of the bralre spider d cams are actuated vat both ends of each brake shoe and one half of the reaction Aot the brake shoe is taken on a Sector instead of boing taken by the brake shoe anchor so that approximately fifty percent more braking power is applied to the brake shoes.-

In Figure 3 there is illustrated a modification of the invention wherein in lieu of the eainining surfaces e" und as toothed sectors are availed of. VSuch parts of the brake mechanism which aresimilar in every respect to 'those' parte illustrated in'Figure `l will not be ligure but have been 'given the saine reference characters. In lieu of the lng a there i5 shown a sector formed with teeth'au adapted to mesh with teeth a" on a Vtoothed sector e carried upon the shafte bearing the cam e. Thus upon rotation of the spider d through the instrumentality of the pull rod the cam e is caused to bear against described with respect to this,

the proximate ends of the brake shoes c by the contact of the sectors e5 and ai.

It will thus be seen that a brake mechanism is proposed wherein only slight initial force is necessary to initiate un action and lhat due to mechanical movements the force. availed ot' by the momentum oi" the element lo he retarded is supplemented or magni lied.

T he invention is not to be deemed limited to its application to the wheel of a motor vehicle but is equally applicable in any situation wherein a rotating element -is to be retarded. Various cti-acting elements such as toothed sectors or cam surfaces` may be availed of `in Ithe instrumentality eiectino the magniiication of the braking action and no limitation is intended by the foregoing description or illustrations except as indcatedin the accompanying claims; i

What I claim is:V

1. In a brake, incombination, a stationary shaft, a brake drum rotatable about said shaft, a brake spider rotatable about said shaft, means to rotate the brake Spider, a pair of brake shoes within the drum, diametrically disposed cam shafts rotatably mounted on the spider, cams on the cam shafts env gnging the proximate ends of the brake shoes, .arms rigidly carried with the cam sha1' is, cams carried with the stationary shaft and engaging the ends of the arms.

Q. In a brake,yin combination, an axle housing, a brake drum' rotatable about the axle housing, a. brake spider rotatable about the axlehousing, means to rotate said spider, a pair tif-brake shoes disposed within the drum, diametrically disposed cam shafts rotatably mounted on the spider, cams carried with said cam vshafts and engaging the proxv imate ends of the brake shoes, arms rigidly carried with the cam shaftsand cams carF ried with the axle housing to be engaged by said arms.-

3. In a brake, in combination, an axle housing, a brake drum rotatable about said axle housing, a brake spider rotatable about the axle housing, means to rotate the-spider, a brake shoe within lt-he brake drum, a cam shaft rotatably mounted on the spider, a cam carried with the shaft and engaging proximate ends ot the brake shoes, an arm rigidly carried with the cam shaft, a sector carried with the axle housing, and a sector carried with the end of the arm and engaging said first' named sector.

4. In a brake, in combination, an axle housing, a brake drum rotatable about said axle housing, a brake spider rotatable about the axle housing, means to rotate the spider, a brake shoe within the brake drum, a cam `shaft rotatably mounted on the spider, a cam carried with the shaft and engaging proximate ends of the brake shoes, an arm rigidly carried with the cam shaft, a toothed sector carried with the axle housing, and a toothed sector carried with the end of the arm and the cam shafts and engaging proximate ends 10 enga ing' said first named toothed sector. of the brake shoes, arms rigidly carried with g 5. n a brake, in combination, an axle the ends of the cam shafts, sectors on the housinga'brake drilm rota-table about the arms, respectively, and sectors carried with axle housing, a brake spider rotatable about the axle housing to be engaged by the sectors the axle housing, means to rotate the spider, on the arms. 15 a pair of brake shoes Within the brake drum, This specification signed this 27 day of diametrically disposed cam shafts rotatably Oct. A. D. 1925.

mounted on the spider, cams carried with GUSTAVUS HA'AG. 

